A group of researchers has estimated how long it took Tyrannosaurus rex to reach its full size — and the time period is ...

For decades, scientists have been counting annual growth rings—similar to tree rings—inside fossilized leg bones of ...

By counting visible and hidden rings, researchers found that T. rex did not reach full size until 35 to 40 years of age.

Dinosaur bones are like trees—every year is represented by a new ring, and paleontologists can count those concentric circles ...

The largest-ever study of how the “king of dinosaurs” grew shows a much longer, slower path to adulthood than scientists ...

By Will Dunham WASHINGTON, Jan 15 (Reuters) - There is no question that Tyrannosaurus rex got big. In fact, this fearsome ...

Pioneering techniques used in this research may soon be applied to other dinosaur fossils and alter the course of ...

For decades, scientists have been counting annual growth rings—similar to tree rings—inside fossilized leg bones of ...

Paleontologists have long debated claims of a dinosaur powerful enough to challenge T-Rex. Fossil evidence suggests ...

Tyrannosaurus rex lived longer and took more time to reach its maximum size than previously thought, according to a new study ...

By cutting into a tiny throat bone, Princeton's Chris Griffin showed that it belonged to an adult of a smaller tyrannosauroid ...